TY - JOUR
T1 - Water-based flexographic ink with tamper detection fluorescence for security printing applications
AU - Muthamma, Kashmitha
AU - Pallavi, B. E.
AU - Sunil, Dhanya
AU - Kulkarni, Suresh D.
AU - Wagle, Shivananda
AU - Kekuda, Dhananjaya
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11/20
Y1 - 2022/11/20
N2 - Smart luminescent materials are widely used in anticounterfeiting for their exceptional features that are easy to authenticate, but hard to duplicate. In order to tackle authentication issues and tamper-proofing of printed documents, a new fluorophore, 2-(2-aminoethyl)− 5-hydroxy-1H-benzo[de]isoquinoline-1,3(2H)-dione (HNEDA) was prepared as a pigment to formulate an ink with unique security features for flexographic printing. The naphthalimide-based molecule obtained through an easy one-pot synthetic procedure was structurally characterised through spectral techniques. HNEDA displayed good thermal stability and photo-physical features. The flexo prints achieved using the water-based formulation of HNEDA on a UV dull paper substrate demonstrated yellow-orange fluorescence when viewed under ultraviolet light. Moreover, secondary security features were explored through the application of various solvents, acids, and bases on the print proofs. A unique phenomenon of penetrating fluorescence on the rear side of the printed substrate, which is difficult to forge but easy to authenticate was observed. This feature provides a distinctive and secure authentication mark to detect tampering in documents/cheques/banknotes etc. Further, the surface morphology analysis, abrasion resistance, colorimetric, and densitometry studies of the prints were also investigated. Furthermore, the p-type semiconducting property and high charge carrier mobility of the prints obtained on low-cost paper substrates using the water-based ink with HNEDA as the functional pigment showcased promising opportunities in secure flexible electronics.
AB - Smart luminescent materials are widely used in anticounterfeiting for their exceptional features that are easy to authenticate, but hard to duplicate. In order to tackle authentication issues and tamper-proofing of printed documents, a new fluorophore, 2-(2-aminoethyl)− 5-hydroxy-1H-benzo[de]isoquinoline-1,3(2H)-dione (HNEDA) was prepared as a pigment to formulate an ink with unique security features for flexographic printing. The naphthalimide-based molecule obtained through an easy one-pot synthetic procedure was structurally characterised through spectral techniques. HNEDA displayed good thermal stability and photo-physical features. The flexo prints achieved using the water-based formulation of HNEDA on a UV dull paper substrate demonstrated yellow-orange fluorescence when viewed under ultraviolet light. Moreover, secondary security features were explored through the application of various solvents, acids, and bases on the print proofs. A unique phenomenon of penetrating fluorescence on the rear side of the printed substrate, which is difficult to forge but easy to authenticate was observed. This feature provides a distinctive and secure authentication mark to detect tampering in documents/cheques/banknotes etc. Further, the surface morphology analysis, abrasion resistance, colorimetric, and densitometry studies of the prints were also investigated. Furthermore, the p-type semiconducting property and high charge carrier mobility of the prints obtained on low-cost paper substrates using the water-based ink with HNEDA as the functional pigment showcased promising opportunities in secure flexible electronics.
UR - http://www.scopus.com/inward/record.url?scp=85136688808&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85136688808&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2022.129910
DO - 10.1016/j.colsurfa.2022.129910
M3 - Article
AN - SCOPUS:85136688808
SN - 0927-7757
VL - 653
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 129910
ER -